The normal specification is 0.5-0.15um of immersion gold over 4-8um
electroless nickel.
I would add that we run our process at 0.7um gold over 5-6um nickel
Thicker deposits of gold (>0.15um) can cause issues with solderability
Dougal Stewart, Exacta Circuits, Scotland

from: [log in to unmask] subject: fabrication

What are PCB mfg's requesting for emersion gold over nickel
thicknesses these days.
Jeff Neisess            EMAIL [log in to unmask]
Eurotherm Controls, Inc
11485 Sunset Hills Rd.
Reston, VA 20190  USA

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